Drill



R. GIESEY DRILL Jan. 16, 1934.

Filed Dec. 12, 1931 Russell @5638? Patented Jan. 16, 1934 UNHTBZD STATES PATENT FFEQE DRILL corporation of Texas Application December 12, 1931 Serial No. 580,608

2 Claims.

This invention relates to drills.

One conventional type of deep well drill includes a roller bit head having a threaded shank that is screwed into a threaded socket in the lower end of the reamer body forming a part of the drill stem. This threaded connection is objectionable for various reasons, of which may be mentioned cost of manufacture and difficulty experienced in properly aligning the reamer cutters with the cutters of the bit.

This invention has for its object the provision of a new and improved coupling means particularly adapted for use in a reamer body and bit head assembly, that can be manufactured at a small cost, that can be quickly and easily assembled and taken apart, and being constructed so that the cutters of the reamer are necessarily in predetermined positions with respect to the cutters of the bit when the parts are assembled.

The preferred embodiment of the invention is illustrated by the accompanying drawing, of which Fig. 1 is a partly sectional side elevation of the assembled reamer body and bit head; Fig. 2, a horizontal section on the line 2-2 of Fig. 1; Fig. 3, a bottom plan View of the assembly shown by Fig. 1, the cutter assembly being removed from the bit head; and Fig. 4, a fragmentary sectional elevation of the assembly taken at a right angle to Fig. 1.

In the drawings, the reamer body is indicated at 1 and the bit head at 2.

The reamer body 1 has a threaded shank let that may be connected to the other part of the drill stem not shown. On opposite sides of the body 1 are a pair of roller reamer cutters 3 and 4. On its lower end, the reamer body 1 has a tapered shank 5, and on the lower end of the shank 5 is a wash plate 6 having water courses '7, 8 and 9. Water, pumped through the drill stem, is directed by the courses 7, 8 and 9 to the cutters of the bit.

The bit cutter assembly shown is of the conventional cross roller type and includes a pair of side roller cutters 10 and 11 and cross roller cutters 12. The side roller cutters 10 and 11 are rotatable on spindles 13 and 14 that extend upwardly and outwardly from bridge 15 into downwardly opening slots 16 and 17 in bearing extensions 18 and 19 of the head 2. The cross roller cutters 12 are rotatable on pin 20 that extends diametrically across the lower end of the head through bridge 15 and has extremities 21 and 22 fitting in downwardly opening slots 23 and 24 of bearing extensions 25 and 26.

Referring now to the present invention, the

shank 5 is downwardly tapered, as shown by Fig. 1; and, as shown by Fig. 2, it is substantially hexagonal in cross section, but one of its surfaces being rounded, as indicated at 27. The head 2 has a socket 28 shaped for the snug reception of the shank 5.

The head 2 has spaced slots 29. Pins 30, inserted in the shank 5, extend into the slots 29. The size of the slots is such with respect to the size of the pins that the pins serve to hold the shank 5 in the socket 28 but permit movement of the shank downwardly in the socket. When the pins 30 are removed, the head 2 may be separated from the body 1.

Excessive downward movement of the hank 5 in the socket 28 is prevented by the engagement of the shoulders 31 and 32 of the body and the head. The shoulders 31 and 32 remain out of contact with each other while the shank moves downwardly into frictional engagement in the socket to hold the body and head rigidly together. But further movement of the shank in the socket, which might split the head 2, is prevented by the engagement of the shoulders 31 and 32.

It will be obvious that when the shank 5 is in the socket 28, the reamer cutter 3 is necessarily above the side cutter 10, and the reamer cutter 4 is necessarily above the side cutter 11; and that the water course 7 is necessarily adjacent the side cutter 10, the water course 8 is necessarily adjacent the side cutter 11, and the water courses 9 are necessarily above the cross cutters 12.

The invention is not limited to the preferred embodiment herein shown. Various changes may be made within the scope of the following claims.

I claim:

1. In a drill, a reamer body having a tapered shank non-circular in cross-section, a cutter on said body, a bit head having a cooperating noncircular socket into which said shank is slidable, a cutter on said head, said reamer body shank having flats along its sides, a plurality of pins secured in the shank, said pins projecting outwardly beyond the shank and extending into elongated slots in the walls of the cooperating bit head socket whereby the bit head is mounted on the reamer body shank in such manner that it may slide thereon upwardly or downwardly a limited distance, the pins in said slots preventing said bit head from falling off the shank.

2. In a drill, a reamer body having a tapered shank non-circular in cross-section, a cutter on said body, a bit head having a cooperating nonthe bit head is mounted on the reamer body shank in such manner that it may slide thereon upwardly against the shoulder on said reamer body or downwardly a limited distance, the pins in said slots preventing said bit head from falling off the shank.

RUSSELL GIESEY. 

